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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc80b0a4b55e5d8c4c7d149a20e1623971369ff82978a37d70f16c3b021eb80' 
  AND token = 'gczF0/5Y7tSEo5K0z/Ti7ooiu+Y2bcXDcRENABmc5+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}